Yep, me too. Thanks again - sums things up nicely. Trouble is you don't know that it's going to happen until it's happened and you then have to wind back the turn, try to identify where the cross-over has occurred, then unpick the movements involved in the hope that they don't create new cross-overs elsewhere. That's atomically annoying.

No doubt there are real-life analogues to this kind of snafu, but in those cases you would at least have the satisfaction of shooting the staff officer responsible!